Alan Mascord Design Associates Inc Depends what you're doing up there! bum bum..!
Seriously though, it depends on what running gear you're using, what support members are needed for your doors, the ceiling etc. Check clearance needs from your manufacturer, and your archtiect or structural engineer.
Seriously though, it depends on what running gear you're using, what support members are needed for your doors, the ceiling etc. Check clearance needs from your manufacturer, and your archtiect or structural engineer.